Spreadsheet Ops
ericrisco/rsc-harness
A skill your agent uses when working a spreadsheet programmatically — writing or repairing a formula, generating an .xlsx with Python including charts and conditional formats, driving Google Sheets…
Create, edit, analyze, or convert Excel spreadsheets (.xlsx, .xlsm, .xltx) where the workbook file is the primary deliverable.
Install XLSX
$ npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install K-Dense-AI/claude-scientific-writer xlsx --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/K-Dense-AI/claude-scientific-writer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/xlsx .claude/skills/xlsx && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "xlsx" agent skill from https://github.com/K-Dense-AI/claude-scientific-writer/tree/main/skills/xlsx into .claude/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/K-Dense-AI/claude-scientific-writer/tree/main/skills/xlsxType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install K-Dense-AI/claude-scientific-writer xlsx --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/K-Dense-AI/claude-scientific-writer.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/xlsx .agents/skills/xlsx && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "xlsx" agent skill from https://github.com/K-Dense-AI/claude-scientific-writer/tree/main/skills/xlsx into .agents/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install K-Dense-AI/claude-scientific-writer xlsx --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/K-Dense-AI/claude-scientific-writer.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/xlsx .cursor/skills/xlsx && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "xlsx" agent skill from https://github.com/K-Dense-AI/claude-scientific-writer/tree/main/skills/xlsx into .cursor/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/K-Dense-AI/claude-scientific-writer.git --path skills/xlsx--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install K-Dense-AI/claude-scientific-writer xlsx --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/K-Dense-AI/claude-scientific-writer.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/xlsx .gemini/skills/xlsx && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "xlsx" agent skill from https://github.com/K-Dense-AI/claude-scientific-writer/tree/main/skills/xlsx into .gemini/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install K-Dense-AI/claude-scientific-writer xlsxInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/K-Dense-AI/claude-scientific-writer.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/xlsx .github/skills/xlsx && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "xlsx" agent skill from https://github.com/K-Dense-AI/claude-scientific-writer/tree/main/skills/xlsx into .github/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install K-Dense-AI/claude-scientific-writer xlsx --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/K-Dense-AI/claude-scientific-writer.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/xlsx .opencode/skills/xlsx && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "xlsx" agent skill from https://github.com/K-Dense-AI/claude-scientific-writer/tree/main/skills/xlsx into .opencode/skills/xlsx/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "xlsx", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
xlsx- GitHub stars
- 2.4k
- Token cost
- ~2.1k tokens
- SKILL.md length
- 1,083 words
- Files
- 58 (incl. scripts)
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- Proprietary
At a glance
Create, edit, analyze, or convert Excel spreadsheets (.xlsx, .xlsm, .xltx) where the workbook file is the primary deliverable.
- Financial models
- SKILL.md covers Requirements for every output, Recalculate (mandatory…, Choosing formulas that survive… and openpyxl gotchas, plus 2 more sections
- Runs Python scripts from its folder; calls uv, python and markitdown
- Multi-sheet workbooks
What it does
XLSX is an agent skill from K-Dense-AI/claude-scientific-writer. Create, edit, analyze, or convert Excel spreadsheets (.xlsx, .xlsm, .xltx) where the workbook file is the primary deliverable. Use for formulas, formatting, financial models, multi-sheet workbooks, and tabular cleanup exported to Excel. Also applies to .csv/.tsv when the user wants spreadsheet output. Do NOT use for Word documents, HTML reports, standalone Python scripts, database pipelines, or Google Sheets API work.
Its SKILL.md is about 2.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 62 other files, including scripts (for example `scripts/office/helpers/__init__.py`, `scripts/office/helpers/pptx_chart.py` and `scripts/office/helpers/pptx_slide.py`). Compatibility notes: Requires Python 3.8+, LibreOffice (soffice on PATH), and gcc only when Unix sockets are restricted
It sits in Documents & Office, covering Excel spreadsheets. It works with Microsoft Excel, Python, Google Sheets and openpyxl. The repository describes itself as: A general purpose scientific writer.
When your agent uses it
- Financial models
- Multi-sheet workbooks
- Tabular cleanup exported to Excel
- Wants spreadsheet output
Example prompts
- “/xlsx”
Requirements
- Python 3
- Compatibility (from SKILL.md): Requires Python 3.8+, LibreOffice (soffice on PATH), and gcc only when Unix sockets are restricted
- Pre-approved tools (allowed-tools): Read, Write, Edit, Bash, Grep, Glob
What it can do on your machine
Read from SKILL.md and the folder at commit 529b9f7. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteEditBashGrepGlob
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 14 files in scripts/ (Python, from the files we listed), which the agent can run.
Shell commands in SKILL.md call:
uvpythonmarkitdown
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Compatibility
Requires Python 3.8+, LibreOffice (soffice on PATH), and gcc only when Unix sockets are restricted
From compatibility in the SKILL.md frontmatter.
Context cost
XLSX loads about 2.1k tokens when it runs. Until then it costs about 107 tokens; SKILL.md has 1,083 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Read, Write, Edit, Bash, Grep, Glob
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
Its licence (Proprietary) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,083 words (~2,135 tokens).
“openpyxl writes formulas as strings with no cached values. Until you recalculate, every formula cell reads back as None to anything reading cached values — pandas, load_workbook(data_only=True), and most previewers.”
- name
- xlsx
- allowed-tools
- Read, Write, Edit, Bash, Grep, Glob
- compatibility
- Requires Python 3.8+, LibreOffice (soffice on PATH), and gcc only when Unix sockets are restricted
- license
- Proprietary. LICENSE.txt has complete terms
- metadata.version
- 2.2
- metadata.skill-author
- Anthropic, PBC
- metadata.adapted-by
- K-Dense Inc.
- metadata.source
- https://github.com/anthropics/skills/tree/main/skills/xlsx
Files
SKILL.md and 57 other files (scripts) in skills/xlsx of K-Dense-AI/claude-scientific-writer.
- SKILL.md
- LICENSE.txt
- scripts/office/helpers/__init__.py
- scripts/office/helpers/pptx_chart.py
- scripts/office/helpers/pptx_slide.py
- scripts/office/helpers/pptx_theme.py
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-chart.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-chartDrawing.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-diagram.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-lockedCanvas.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-main.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-picture.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-spreadsheetDrawing.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/dml-wordprocessingDrawing.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/pml.xsd
- scripts/office/schemas/ISO-IEC29500-4_2016/shared-additionalCharacteristics.xsd
- … and 42 more
Open the folder on GitHubat commit 529b9f7
Compare with similar skills
XLSX next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| XLSX this skillK-Dense-AI/claude-scientific-writer | 2.4k | — | ~2.1k | Automated safety check: Notes | Proprietary | |
| Spreadsheet Opsericrisco/rsc-harness | 180 | — | ~2.9k | Automated safety check: Pass | MIT | |
| Excel Spreadsheet Creation and Editinganthropics/skills | 180k | 4 repos | ~2.1k | Automated safety check: Pass | Proprietary | |
| XLSXrvdbreemen/OTGW-firmware | 207 | 35 repos | ~2.9k | Automated safety check: Pass | Proprietary | |
| Office File Processxstongxue/best-skills | 3k | — | ~1.8k | Automated safety check: Pass | Proprietary | |
| Excel Workbook EditorTokenRhythm/opensquilla | 7.1k | — | ~1.6k | Automated safety check: Pass | Apache-2.0 |
Similar skills
- Official
Excel Spreadsheet Creation and Editing
anthropics/skills
Creates, edits and analyzes spreadsheets (.xlsx, .xlsm, .csv, .tsv) with openpyxl and pandas, writing live formulas and recalculating to confirm zero formula errors.
XLSX
rvdbreemen/OTGW-firmware
Use this skill any time a spreadsheet file is the primary input or output.
Office File Process
xstongxue/best-skills
处理 Office 文档的一站式 skill：Word(.doc/.docx/.dotx)、Excel(.xls/.xlsx/.xlsm/.csv)、PowerPoint(.ppt/.pptx/.potx) 的创建、读取、编辑、提取、转换、校验。触发：『读取 word 文档』『提取 excel 内容』『看 ppt 讲了什么』、.doc 老格式打不开、生成/编辑 Word…
Excel Workbook Editor
TokenRhythm/opensquilla
Inspects, edits in place or creates Microsoft Excel .xlsx workbooks with openpyxl, treating each cell as a typed number, string, datetime or formula value.
Markdown Converter
Team-Commonly/commonly
Convert binary documents (PDF, DOCX, XLSX, PPTX, HTML, EPUB, images) to clean LLM-friendly Markdown using Microsoft's markitdown Python tool.
More from K-Dense-AI/claude-scientific-writer
All 21 skills in this repoCitation Management
K-Dense-AI/claude-scientific-writer
Finds papers in OpenAlex, PubMed and Google Scholar, turns DOIs, PMIDs and arXiv IDs into clean BibTeX, and validates citations for a manuscript or thesis.
Hypothesis Generation
K-Dense-AI/claude-scientific-writer
Formulate evidence-bounded scientific questions, candidate hypotheses, rival explanations, causal or associational claims, discriminating predictions, measurements, and preregistration-ready…
Peer Review
K-Dense-AI/claude-scientific-writer
Prepare evidence-bounded, constructive peer-review drafts and structured manuscript assessments.
PPTX Posters
K-Dense-AI/claude-scientific-writer
Create and audit editable scientific posters in macro-free PowerPoint (.pptx) from author-approved local content and assets.
Scholar Evaluation
K-Dense-AI/claude-scientific-writer
Provide qualitative-first, evidence-traceable developmental review of scholarly works and audit low-stakes research-assessment rubrics with optional local quality controls.
Scientific Writing
K-Dense-AI/claude-scientific-writer
Draft, revise, and audit scientific manuscripts or reports with explicit evidence provenance, reporting-guideline coverage, authorship accountability, confidentiality controls, and local consistency…
Related
Categories
Questions about XLSX
What does XLSX do?
Create, edit, analyze, or convert Excel spreadsheets (.xlsx, .xlsm, .xltx) where the workbook file is the primary deliverable. XLSX is an agent skill from K-Dense-AI/claude-scientific-writer.xltx) where the workbook file is the primary deliverable.
When should I use XLSX?
XLSX fits situations like: financial models; multi-sheet workbooks; tabular cleanup exported to Excel; wants spreadsheet output.
How do I install XLSX in Claude Code?
Run `npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a claude-code`. Or copy the skill folder (skills/xlsx in K-Dense-AI/claude-scientific-writer) into .claude/skills/xlsx in your project. Claude Code loads it when a task matches its description.
How do I install XLSX in Codex?
Run `npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a codex`. Or copy the skill folder (skills/xlsx in K-Dense-AI/claude-scientific-writer) into .agents/skills/xlsx in your project. Codex loads it when a task matches its description.
Can I use XLSX in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add K-Dense-AI/claude-scientific-writer --skill xlsx -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/xlsx, .gemini/skills/xlsx, .github/skills/xlsx and .opencode/skills/xlsx in your project.
What does XLSX need to run?
Going by SKILL.md and its folder, XLSX needs Python for the scripts in its folder and the command-line tools its instructions call (uv, python and markitdown). Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Write, Edit, Bash, Grep, Glob. Compatibility (from SKILL.md): Requires Python 3.8+, LibreOffice (soffice on PATH), and gcc only when Unix sockets are restricted.
Does XLSX access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is XLSX safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does XLSX use?
XLSX carries a proprietary licence (declared in SKILL.md). It is published on GitHub, but it is not open source: read the licence file before using or sharing it.
How many tokens does XLSX use?
About 2.1k tokens (SKILL.md is roughly 8.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to XLSX?
Skills that share tags, products or a category with XLSX: Spreadsheet Ops (ericrisco/rsc-harness, 180 stars), Excel Spreadsheet Creation and Editing (anthropics/skills, 180k stars), XLSX (rvdbreemen/OTGW-firmware, 207 stars) and Office File Process (xstongxue/best-skills, 3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains XLSX?
K-Dense-AI (a GitHub organization) maintains it in K-Dense-AI/claude-scientific-writer, which has 2,437 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 9, 2026.
Source: K-Dense-AI/claude-scientific-writer on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.